STUDIES ON PAIUSITIO PROTOZOA. 
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tolog y ^ (1912), an acconnfc which I am now able to amplify 
in certain particulars that seem to me to bear on the probable 
affinities of Polymastix with Lophomonas. 
Polym astix from T ipula. Characteristic flagellate individual, 
showing four flagella, ribl)ed periplast, pear-shaped nucleus, 
with karyosonie, cytostome, basal granules, axostyle, and 
ingested bacteria. 
Description. 
Body pear-shaped to spindle-shaped; the anterior 
end rounded, the posterior end tapering, or often 
